• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

idle probs

  • Thread starter Thread starter manpowermustang
  • Start date Start date Oct 5, 2004
M

manpowermustang

Member
Sep 25, 2004
228
0
16
Milwaukee, Wi
Oct 5, 2004
#1
  • Oct 5, 2004
  • #1
My6 mods are below. I set my idle and its good for a while. then it get all stupid and jumps up from 900r,s to 1200. then the next time I start it , it may be fine. I wish the damn thing would just stay at a constint idle insted of being all over the board at times.. new motor too.
 

Blandnuts

I don't swallow; I only swoosh
Founding Member
Aug 21, 2000
1,172
124
124
FloorDuh
Oct 5, 2004
#2
  • Oct 5, 2004
  • #2
Here's a list of things to check...
1. Vacuum lines (possible leak/line not attached)
2. Clean IAB
3. Check TPS- KOEO, voltage should be .9-.99
4. Make sure the screw on the throttle bodie is adjusted right.


hope this helps.



fred
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Oct 5, 2004
#3
  • Oct 5, 2004
  • #3
also note that if you try to manually adjust the idle up (or it is not set right, as Blandnuts referred to), the puter will still try to get it back down to baseline, which can create some strange things (idle hunt, etc).

BTW, Fred's list is right on.
 

Blandnuts

I don't swallow; I only swoosh
Founding Member
Aug 21, 2000
1,172
124
124
FloorDuh
Oct 5, 2004
#4
  • Oct 5, 2004
  • #4
HISSIN50 said:
also note that if you try to manually adjust the idle up (or it is not set right, as Blandnuts referred to), the puter will still try to get it back down to baseline, which can create some strange things (idle hunt, etc).

BTW, Fred's list is right on.
Click to expand...


I suggest the throttle body because it's new and I know they don't come adjusted . See ya on the next post
 
You must log in or register to reply here.

Similar threads

L
Engine 85 GT Excessive Idle
  • lutzkecj
  • Sep 18, 2026
  • Fox 5.0 Mustang Tech
Replies
5
Views
259
Fox 5.0 Mustang Tech Sep 21, 2026
86HO5.0
8
7
Engine Random hanging idle
  • 706 Saleen
  • Feb 11, 2026
  • Fox 5.0 Mustang Tech
Replies
9
Views
751
Fox 5.0 Mustang Tech Feb 19, 2026
86HO5.0
8
K
Resolved Need some assistance. Holley Terminator X alongside H/C/I. Very rough/inconsistent idle
  • karhoot
  • Jun 6, 2026
  • Fox 5.0 Mustang Tech
Replies
0
Views
154
Fox 5.0 Mustang Tech Jun 6, 2026
karhoot
K
C
Engine Idle cuts out
  • claypoolxx
  • Mar 7, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
25
Views
1K
Fox 5.0 Mustang Tech Jul 24, 2026
alutwon
K
Resolved Weird sound coming from a freshly rebuilt 5.0L
  • karhoot
  • Jun 24, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
305
Fox 5.0 Mustang Tech Jun 27, 2026
Mac131
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?